<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../react18/react.development.js"></script>
    <script src="../react18/react-dom.development.js"></script>
    <script src="../react18/babel.min.js"></script>
</head>

<body>
    <div id="app"></div>
    <script type="text/babel">
        

        class Content extends React.Component {
            //组件实例有state属性,当state属性状态发生改变时,会触发render,得到一个新的虚拟DOM
            //然后diffing算法将新旧虚拟DOM进行比对,重新渲染页面
            //state的初始值是null
            state = {
                content: "真NP",
                count: 0,
                isHot: true
            }
            render() {
                console.log(this);
                const {content,count,isHot} = this.state
                return (
                    <div>
                        <h1>title</h1>
                        <p>{content}</p>
                        <p>{count}</p>
                        <p>{isHot ? "热啊" : "冷啊"}</p>
                    </div>
                )
            }
        }
        const root = ReactDOM.createRoot(document.getElementById('app'));
        root.render(<Content />)
    </script>
</body>

</html>